How is this different from the online editors?

Morph runs FFmpeg via WebAssembly in your browser tab — drop a video, drop a music track on its own row, balance and export. No upload, no watermark, no Pro wall, no app install.

Can I balance the music against the original audio?

Yes. The transport bar has volume control with mute toggle. The audio scope panel shows real-time L/R channel meters with dB markers (0, -6, -12, -∞) so you can ride the music level under dialogue without clipping. Each track can be muted or hidden independently.

What export formats and platforms?

MP4 (H.264 + AAC), WebM (VP9 + Opus), or optimized GIF. Pre-configured platform presets for YouTube (1080p), Instagram (1080×1080), TikTok (1080×1920), Twitter, plus a Custom option for arbitrary resolution and bitrate.

Add Music to Video — The Video, With the Right Song Under It.

Q: What audio formats can I add?

MP3, WAV, AAC, OGG, FLAC, and Opus. Drop any of these onto an audio track and Morph mixes them with the video during export. Different tracks can hold different formats — Morph normalizes them in the final mux.

Q: Are my files uploaded?

No. Everything runs locally in your browser tab using FFmpeg compiled to WebAssembly. Your video and audio never leave your device. There's no cloud render queue and no data collection. For a wedding cut, a client project, or any unreleased content — none of it touches a third-party server.

Q: Does it work on iPhone or iPad?

Yes — Safari on iOS supports SharedArrayBuffer with the COOP/COEP headers Morph sets. Drop video and music, balance levels, export. The mux runs locally on your phone, never touches a server. For multi-track work, a desktop or laptop is more comfortable, but the engine itself runs anywhere.

What it actually does

02

FORMATS

Six audio inputs

MP3, WAV, AAC, OGG, FLAC, Opus. Different tracks can hold different formats — Morph normalizes in the final mux.

03

EXPORT

Platform presets

YouTube, Instagram, TikTok, Twitter, custom. MP4 or WebM.

04

PRIVATE

Local-only

Wedding cut, client project, unreleased — none of it touches a server.

How it works

Open morph.cool/video-editor in any modern browser. No install, no account.
Drop the .mp4, .mov, .webm, or .mkv onto the video track. Morph decodes locally.
Drop the .mp3, .wav, .aac, .ogg, .flac, or .opus onto a separate audio track. Position the in point.
Watch the L/R meters while you balance volume. Mute the original audio if you're replacing it entirely.
Pick an export preset. The muxed file lands on your machine.

Why "add music to video" sites paywall it

Multi-track audio is the feature every free online video editor uses to push you to Pro. The free tiers give you a single audio track, or multi-track behind an app install and a Terms of Service that grants the company a sweeping licence to your uploaded footage. Flowcut runs FFmpeg in your browser tab — multi-track audio is just standard video editor architecture, exposed with no paywall. The mux happens locally. Your video stays your video.

Frequently asked

What audio formats can I add?

MP3, WAV, AAC, OGG, FLAC, Opus. Tracks can hold different formats — normalized in the final mux.

Are my files uploaded?

No. FFmpeg.wasm in your tab. Wedding cut, client project, unreleased — none of it touches a server.

Can I balance music against the original audio?

Yes. Real L/R meters with dB markers (0, -6, -12, -∞). Mute or hide each track independently.

What export formats?

MP4 (H.264 + AAC), WebM (VP9 + Opus), or GIF. Platform presets for YouTube, Instagram, TikTok, Twitter.

Does it work on iPhone or iPad?

Yes — Safari on iOS supports SharedArrayBuffer with COOP/COEP headers. Multi-track is more comfortable on a desktop, but the engine runs anywhere.

While you're here Open Flowcut Free Video Editor Audio Converter Video to MP3 Online Video Trimmer Morph Pro

Add Music to Video The video, with the right song under it.

Drop the song on its own row, ride the level with real L/R meters.